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Bug#11765108 (Bug#58036) client utf32, utf16, ucs2 should be disallowed, they crash server

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Problem: ucs2 was correctly disallowed in "SET NAMES" only,
while mysql_real_connect() and mysql_change_user() still allowed
to use ucs2, which made server crash.

Fix: disallow ucs2 in mysql_real_connect() and mysql_change_user().

  @ sql/set_var.cc
    Using new function.

  @ sql/sql_acl.cc
    - Return error if character set initialization failed
    - Getting rid of pointer aliasing:
      Initialize user_name to NULL, to avoid double free().

  @ sql/sql_connect.cc
    - in case of unsupported client character set send error and return true
    - in case of success return false

  @ sql/sql_connect.h
    - changing return type for thd_init_client_charset() to bool,
      to return errors to the caller

  @ sql/sql_parse.h
    - introducing a new function, to reuse in all places where we need
    to check client character set.

  @ tests/mysql_client_test.c
    Adding test
This commit is contained in:
Alexander Barkov
2011-02-18 12:46:55 +03:00
parent 498ff4468d
commit b97cdadbe8
6 changed files with 106 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
sql/sql_connect.cc
View File

@ -370,8 +370,23 @@ void reset_mqh(LEX_USER *lu, bool get_them= 0)
}
void thd_init_client_charset(THD *thd, uint cs_number)
/**
Set thread character set variables from the given ID
@param thd thread handle
@param cs_number character set and collation ID
@retval 0 OK; character_set_client, collation_connection and
character_set_results are set to the new value,
or to the default global values.
@retval 1 error, e.g. the given ID is not supported by parser.
Corresponding SQL error is sent.
*/
bool thd_init_client_charset(THD *thd, uint cs_number)
{
CHARSET_INFO *cs;
/*
Use server character set and collation if
- opt_character_set_client_handshake is not set
@ -380,10 +395,10 @@ void thd_init_client_charset(THD *thd, uint cs_number)
- client character set doesn't exists in server
*/
if (!opt_character_set_client_handshake ||
!(thd->variables.character_set_client= get_charset(cs_number, MYF(0))) ||
!(cs= get_charset(cs_number, MYF(0))) ||
!my_strcasecmp(&my_charset_latin1,
global_system_variables.character_set_client->name,
thd->variables.character_set_client->name))
cs->name))
{
thd->variables.character_set_client=
global_system_variables.character_set_client;
@ -394,10 +409,18 @@ void thd_init_client_charset(THD *thd, uint cs_number)
}
else
{
if (!is_supported_parser_charset(cs))
{
/* Disallow non-supported parser character sets: UCS2, UTF16, UTF32 */
my_error(ER_WRONG_VALUE_FOR_VAR, MYF(0), "character_set_client",
cs->csname);
return true;
}
thd->variables.character_set_results=
thd->variables.collation_connection=
thd->variables.character_set_client;
thd->variables.character_set_client= cs;
}
return false;
}